Flaked beta naphthol and process of making same



Aug. 3 192e. 1,594,390

vN, E. VAN STONE ET Al.

FLAKED BETA NAPHTHOL AND PROCESS OF MAKING SAME Filed Feb. l5 1924 u( WQ U L f Patented Aug. 3, 1926.

UNITED STATES PATENT OFFICE.

NATHAN E. VAN STONE AND CHARLES E. DEEDS, OF CHICAGO, ILLINOIS, ASSIGNOR-S TO THE SHERWIN-WILLIAMS COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

i FLAKEI) BETA NAPI-ITHOL ANDL PROCESS OF MAKING SAME.

Application filed February 1,3, 1924.

This invention relates, to a'new commercial torm ot' beta naphthol and process t'or producing` the same.

The objects ot the invention are to convert molten beta naphthol into thin llakes expeditiously,

Beta naphtliol is initially produced, by the ordinary commercial process, in the term of a white solid and is chemically known as a phenol or naphthol. It used very generally in a number ot commercial processes and is one of the. most important materials trom which a certain class of dyestuii's is manutaetired. The condition in which it has been heretofore n'iarketed is as a tine powder` or ol' a tlutty sublimed nature. The usual method hereto'liore employed tor producing these commercial forms ot beta naphthol to run the molten material from the still, into pans, where it is permitted to cool oli", then l.roken into lumps, after which it is reduced to the required tineness in a mill or disintenrator,

Many of the processesl using' beta naphthol require that. it be put into solution in certain weak solvents` other than water, in which beta naphthol is practically insoluble. In order to dissolve beta naphthol in these solvents, in any reasonable or workn'ianlike fftime. it is necessary that it be linely divided,

and when thus tinely divided it has disagreeable and dangerous features, which make it very hard to handle. Then Afreshly ground and in a [inely divided state, it is poured or otherwise removed by the user from the package in which it has been shipped by the manufacturer and this results in the material flying` out into the air and its irritating properties and' obnoxious odor render-it exceedingly disagreeable to the workmen who handle it. Vhile its ettect on the human organism is not violent, or immediately destructive,'it is well known that the cumulative ette-ct of this chemical. as otothers in its class. is deterent. to the en Serial No. 692.480.

joyment ot normal health and bodily comfort. l

Another disadvantage ot .finely divided beta naphthol is its tendency to cake in the indiane, when stored, and frequently the contents ot the package assume a hard, mass-like structure that is diiicult to unpack and which makes it practically impossible to use in the way in which it was intended. lt is not commercially feasible to ship in lumps and -require the user to `ig'rind his own supply, as the grinding ot beta naphthol is attended by considerable danger ol' a dust explosion.

A further objection to the powdered, technical beta naphtholis its tendency to lose its original white or grayish white color, on storage, and become dark brown or otherwise badly discolored. lVliile this discoloration is not an absolute indication ot the true quality ot the material. it being regarded more as an oxidation ot the small amounts ot impurities therein than as a change inthe beta naphthol itself. it is a bar to the sale ot beta naphthol which has beenA stored t'or any considerable period ot time.

It is the object of this invention to over come the above-mentioned disadvantages of powdered beta naphthol and provide a new commercial term ot the material which does not become caked in the package or lose its original structure` within any reasonable length ot time duringy which it mightordi narily be necessary to store it, say tor a period ot six months. vThe invention also has tor its object.. the production ot smooth laminated chips or flakes which present uni- 't'orm fractures and retain their original color for a-relatively long period of time, say tor a month to six months.

Our invention will be described in connection with the apparatus illustrated in the aecompan vingdrawings, of which:

Figure l is a plan View of a machine for producing beta naphthol in the improved form referred to.

Fig. 2 is a Side elevation thereof; and

Fig. 3 is an enlarged detail illustrating the method of tlaking; the material.

lReferring to the drawings, 10 indicates a suitableframe which carries the journal boxes 1 1 and l2 for the shaft 13. This shaft has secured thereon a relatively wide faced drum 14 and a pulley 15 by which the drum may be rotated from an 1 suitable source of power. It will be une erstood that there may be substituted for the pulley 15 any equivalent means for rotating the shaft 13.

A pan or receptacle 15 is arranged below the drum 14 and, when the machine is in operation, this receptacle 15 contains molten beta naphthol into which the periphery of the drum 14 dips, the usual level of the molten material being indicated at 15". It is highly desirable that the receptacle 15 be heated by suitable means for retaining the molten material at the required temperature and, for this piirpose, I have shown beneath the receptacle 15 the steam coils 16 but it will be understood that any other suitable heating means may be used.

The frame 10 also carries the boxes 17 in which the bearings 18 are adjustable by means of the screws 19.-` The bearings 18 carry the shaft 20 and this shaft carries a roller 21, the length vof which is practically the same as the length of the drum 14. 1

As the drum 14 revolves in the directibn of the arrow in Fig. 2, its periphery is coated with the molten beta naphthol," from the reeeptaole l5', and the roller 21 is adjusted into close relation with the periphery of the drum 14 for the purpose of smoothing out the corgealed beta naphthol to a uniform thickness, which may be regulated by means ofthe adjusting screws 19.

On the opposite side of the drum 14, from the roller 21, the frame 10 carries boxes 22 in which the bearings 23, for the shaft 24, are slidably mounted. The sha-ft 24 carries a roller 25, the surface of which is fiuted or serrated, as best shown in Fig. 3. The bearings 23 are adjustable in the boxes 22 and the edges of the iiutes or serrations of the roller 25 are held against the periphery of the drum 14 by means of 'springs 26, or other suitable devices, the pressure of which may be regulated by means of screws 2T.

The rollers 21 and 25 are driven by the drum 14 and by the time the material reaches the roller it has cooled to a practically solid condition and the edges of the flutes or serrations of the roller 25 will indent or cut the material along uniformly spaced parallel lines extending in the direction of the axis of the drum (see Fig. 3).

`Below the roller 25 there is a knife or scraper 28 which .is adjustable toward and away from the periphery of the drum 14, but which, in the operation of the machine, presses against the periphery of the drum and scrapes the material off as the drum revolves. A 1 will be readily understood, especially from Fig. 3, the material leaves the drum in the form of relatively long strips of uniform width and thickness which, on falling from the knife or scraper 28 into asuitable receiving pan 29, vill break up into flakes of varying length.

The flaked beta naphthol thus produced may be safely handled as it will not fly into the air when poured out of a package and, wey have found, will not cake in the package, wi'hin a reasonable time', or become discolored.

Having thus described our we claim is:

1. As a new article of manufacture, beta naphthol in the form of flakes of uniform thickness and width.

2. As a new article of manufacture, beta naphthol in the form of flakes of uniform thickness.

In testimony tures.

invention, what whereof We affix our signa- NATHAN E. VAN sfroNE. CHARLES E. Dnnns. 

